From ffc384e044d8e312cad13b67b9ae27878804336c Mon Sep 17 00:00:00 2001
From: Varun Gupta <varun.gupta@mariadb.com>
Date: Tue, 12 Jan 2021 11:50:31 +0530
Subject: [PATCH] MDEV-23804: Server crashes in
 st_select_lex::collect_grouping_fields_for_derived

The issue here was we were trying to push an extracted condition for a view into the
underlying table value constructor inside the view.
The fix would be to not push conditions into table value constructors.
---
 sql/sql_derived.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sql/sql_derived.cc b/sql/sql_derived.cc
index dc079ba6f16..500cb43339e 100644
--- a/sql/sql_derived.cc
+++ b/sql/sql_derived.cc
@@ -1453,6 +1453,8 @@ bool pushdown_cond_for_derived(THD *thd, Item *cond, TABLE_LIST *derived)
   for (; sl; sl= sl->next_select())
   {
     Item *extracted_cond_copy;
+    if (!sl->cond_pushdown_is_allowed())
+      continue;
     /*
       For each select of the unit except the last one
       create a clone of extracted_cond